Wooden block for pavements.



PATENTED JULY 18. 1905.

F. J. WARREN, DEGD.

RNL. WARREN a; r. e. GUTTER, ADMINISTBATOBS.

WOODEN BLOCK FOR PAVEMENTS.

APPLICATION FILED JUNE 21, 1902.

\A/ITHESSEE:

Anonzvl a. BRAND! 80., umOMAPHEIIs. wAsnmmum n. c.

rammed July is, 1905.

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PATENT FREDERICK J. WARREN, OF NEWTON, MASSACHUSETTS; RALPH L. VVAR-REN, OF BROOKLINE, MASSACHUSETTS, AND FRANK Gr. CUTTER, OF BOSTON,MASSACHUSETTS, ADMINISTRATORS OF SAID FREDERICK J.

WARREN, DECEASED.

WOODEN BLOCK FOR PAVEMENTS.

SPECIFICATION forming part of Letters Patent N0. 794,758, dated July 18,1905.

Application filed June 21, 1902. Serial No. 112,711.

To all whom it may concern:

Be it known that I, FREDERICK J. WAR- REN, a citizen of the UnitedStates, and a resident of Newton, in the county of Middlesex and Stateof Massachusetts, have invented a new and useful Improvement in WoodenBlocks for Pavements, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, forming apart of this specification, in

explaining its nature.

The invention relates to the hereindescribed improvement in woodenblocks intended for forming street-pavements.

It consists in taking blocks of the desired shape and condition and insaturating such blocks with a composition comprising a bituminousmaterial and creosote or other preservative oil. This composition shouldcontain from twenty to thirty per cent. of the bituminous material andfrom seventy to eighty per cent. of the creosote or similar preservativeoil, which are intimately combined together, forming a mixture of large2 5 fluidity.

I prefer to use a natural or artificial asphalt for the bituminousmaterial, but do not confine myself thereto. The composition is forcedinto the pores of the wood by the vaco uum process or in any other ofthe ordinary ways in which oils or other preservatives are now appliedto wood. A wooden block thus saturated with a composition of bitumen andcreosote is desirable for use in constructing 3 5 pavements and roadwaysin that the creosote is held by the bituminous portion of thecomposition from evaporating, the bituminous portion of the compositionserving to harden in the outer surface of the block, thus providing anenamel which seals the pores and prevents the escape by evaporation ofthe preserving-oil. It is not feasible and perhaps not desirable to usea composition which is entirely bituminous. It would be too thick ig/andheavy to make suitable penetration of the block; but when combined withthe creosote-oil the mixture is so fluid that the bituminous part isforced into the pores, as well as the preserving-oil.

The proportion of bitumen to the oil may be varied with the degree ofporosity of the wood.

While I contemplate the use of a chemically pure asphalt or pure bitumenwith the creosote-oil, so that it will penetrate freely into the wood,itshould be understood that I do not preclude the use of the commercialasphalts. I desire to note, however, that the commercial asphalts whichhave heretofore been used commercially are not pure bitumen, and it hasnot been practicable or commercial to cause the commercial asphalt,which is not pure bitumen, to penetrate the wood on account of thenon-bituminous substances in it filling up the pores of the wood andpreventing the bitumen itself from entering the Wood. The pure bitumen,which I contemplate using, will form a perfect union with the oilsthemselves and will enter the fiber of the wood, as well as will theoil, thus making a combination of the most permanent bituminous matterwith creosote or a similar preserving oil and obtaining the sealingvalue of one and the preserving power of the other, the preservinginfluence being accomplished entirely by the filling of all voids in thewood with bituminous substances which absolutely preclude the entranceof air, water, or acids, which in themselves are the causes ofdeterioration, rotting, and dis- 8o integration of the wood, while, onthe other hand, the preserving-oils are prevented from leaving the woodby evaporation.

I will now describe the invention in conjunction with the drawings,forming a part 8 5 of this specification, wherein Figure 1 is a view inperspective of a Wooden paving-block with its pores unfilled, and Fig.

2 is a View of the complete block with its pores filled. 9o

Having thus fully described my invention, 2. As an article ofmanufacture a wooden I0 I claim and desire to secure by LettersPatpaving-block the pores of which contain a ent of the United Statesmixture about twenty to thirty per cent.

1. As an article of manufacture a wooden comparatively pure bitumen andaboutsev- 5 paving-block the pores of which contain bienty to eighty percent. creosote.

tumen in a fiuX of a light preservative in the FREDERICK J. WARREN.proportion of about seventy to eighty per In presence of I cent. of theflux to about twenty to-thirty RALPH L. WARREN,

per cent. of bitumen. ALBERT O. 'WARREN.

